Over current

I have a 2nd-gen ipod shuffle, connecting it to a MacBook, i get the Over Current warning and it will not charge. it used to work fine then it suddenly stopped working yesterday, no changes made that i can remember.

Take both to an Apple Store for analysis...

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USB OVER CURRENT NOTICE

I keep receiving this error message in a dialog box, repeatedly; so much so, in fact, that it is affecting productivity: "USB OVER CURRENT NOTICE - A USB device is currently drawing too much power. The hub to which it is attached to will be deactivated".
The only thing attached by external USB is the stock Apple mouse; in fact, this machine is plain vanilla, nothing-that-didn't-come-out-of-the-box stock Apple. I have tried resetting the SMC. I have tried a different mouse. I have tried no mouse. I have tried all the different USB ports in the back. I performed a shutdown and left everything unplugged for half an hour. There isn't any relevant help on Apple's support site.
Any ideas?

I don't know if this helps but...
I have five 24" iMacs in a education lab that keep telling me "USB Current Overload," even though only the Apple keyboard is attached. It seems they starting giving me the message the first time I turned them on. However, after a great talk with an Apple Tech person, we deduced that it must be a driver I installed on the five machines. We came to this conclusion because when I boot the machine from the OS CD, the problem doesn't happen. When I reboot from the hard drive, the message incessantly pops up, even with just the keyboard and mouse (that it came with) plugged in. On one machine in particular, the message pops up so many times that I can barely use the machine.
I have installed two external devices driver's on this machine, a Novation ReMote Compact SL driver and a TC Electronics 24 D firewire driver. I also have "frozen" these machines using DeepFreeze, which keeps students from installing things or chaning settings. My assumption is that one of these drivers is causing the bogus message. Since the computer works fine when booting up from the OS CD, this is the only thing that could be happening. Some other driver is causing the machine to think a USB device is drawing too much power. At least, I think this is what is happening. I'm still working on fixing this problem, but have not been successful yet with removing drivers.

My imac is frozen with the following notice: USB over current notice. have tried powered hub, no help. have tried unplug and restart, no help. any suggestions?

my imac is frozen with the pop up notice of "usb over current notice, a usb device is currently drawing too much power. the hub it is attached to will be deactivated". have tried unplug and restart, no help. have tried power hub, no help. my wired keyboard and mouse do not work. help.

Unplug all devices including your mouse and keyboard. Now do a
SMC RESET
http://support.apple.com/kb/HT3964
Shut down the computer.
Unplug the computer's power cord and ALL peripherals.
Wait 15 seconds.
Attach the computer's power cable.
Wait another 5 seconds and press the power button to turn on the computer.
It is the 5 second timing that initiates the reset.
If it starts up normally plug in 1 item at a time. You may have a defective device that is drawing too much current.

"USB Over Current" warnings worse in Leopard than Tiger

Here's a tricky one:
Just bought a 2006 MacBook Pro
2.16GHz, 2GB Ram, 120 GB HD
It came with an openly disclosed problem: a consistent "USB Over Current" error message popping onto screen. (yes, I've read relevant threads and tried resetting PRAM, etc, as did the guy from whom I purchased it). The guy from whom I purchased it was told by a friend in IT that it needs a new USB hub (and that might be correct).
According to the guy and from what I've so far experienced, the USB drives function -- the only problem is the error message.
I used the system disks to perform a hardware test, and also to re-install Tiger (a downgrade from Leopard).
FIRST CLUE -- the Hardware Test
When I perform the "Apple Hardware Test" (version 3A107) the short version shows "no errors" but the extended version gets stuck on "testing memory" (according to the progress bar)
The screen bounces (shimmies) but I believe the error code is:
0x80000009
And:
"ERROR: 0x80000009 requested size: 0xaf
and then another with 0xa4
and another with 0xa4 again
HOWEVER, when the test concludes (in a length of time much greater than its 10-minute estimate), the official word is that there is no hardware problem. (The two RAM modules are the ones specified, and resetting them and removing one did not alleviate the problem).
SECOND CLUE -- Almost no Problem in Tiger
The interesting thing is that with Tiger installed, I got the USB Over Current warning only upon the initial boot. I thought I had just about cured the problem.
THIRD CLUE -- Re-installing Leopard
I took my commercial copy of Leopard and reinstalled. It was interesting that according to what I was seeing onscreen, the installation stalled with 7 minutes to go. But when I rebooted from the start-up disk -- there was Leopard. (Could it have been only partially installed?)
Unfortunately, I didn't see how the computer was running before updating to 10.5.8.
FOURTH CLUE -- Software Updates
The "USB Over Current Warning" now come in cascades of five. And the barrages are frequent. Again, however, they don't seem to do anything except block screen view.
I'm wondering if something in the updates has exacerbated the problem? Here are the updates:
"Pages Update" (2.0.1v2)
"Keynote Update" (3.0.1v2)
"QuickTime" (7.6.9)
"GarageBand Update" (3.0.2)
"iDVD Update" (6.0.4)
"iWeb Update" (1.1.1)
"iTunes" (10.2)
"iMovie HD Combo Update" (6.0.2)
"iPhoto Update" (6.0.4)
"Mac OS X Update Combined" (10.5.8)
Okay, that's the relevant info. I would gladly replace the USB hub, if there's a video that shows how and I know what part to purchase.
Otherwise, what would you do?
Thanks to all who've taken time to analyze this situation.
Kind regards,
Terry D

"USB Over Current Warning"
One thing you have not mentioned is if you have any peripherals connected to the USB when the error message pops up?
I would gladly replace the USB hub, *if there's a video* that shows how and I know what part to purchase.
YouTube's "How To" tutorials
You can also visit Do-It-Yourself Laptop Repair and the FixYa websites.

USB Over Current Notice - Macbook Pro 2006

I had an external hard drive connected to one of my USB ports, and I think the AC Power adapter it was using flipped out. The drive no longer works at all. The port (front left) does not work with any devices (powereded or not) now, but the other two USB ports do (powered devices or not). I figured I'd have to take it in to the shop if I want to get the dead USB port working again. Or, is that something I may be able to fix? Anybody know?
Everytime I power up the computer now, I get this notice: "USB Over Current Notice, A USB device is currently drawing too much power. The hub it is attached to will be deactivated."
It must be referring to the front left port as a hub, right? And since the other ports are still working, am I correct in thinking that each port must be considered an independent hub from the others?
I find it notable that the dead USB port is reporting to continually be "drawing too much power." Maybe the circuitry is just fried so it keeps reporting it??? I have nothing plugged into the port in question.
Does anybody have any helpful ideas how I can remedy this issue besides taking it in to the shop? Anything I can do through software?
Message was edited by: Adam Berkey

time to re-think cost vis-a-vis reliability of these macbook pros
*BINGO !*
Plus,... when you live in the middle of nowhere -like me- and that the nearest Apple authorized reseller doenst give the Apple Care service ? (yes ! I swear, not a lie)
Plus, ... when calling the US complaining the bad Apple service in LatAm, there is no reply ..
Plus, ... no way to contact Apple LatAm ( its a continent, right ? ) Apple LatAm is the only location without phone number in the International Technical Support Numbers ..
I feel VERY VERY alone and frustrated. btw I bought the dearest computer in the world, in order to get the best quality and service
If someone could give me a phone number where I could complain about Apple Care in Argentina
I would be very happy
Thanks for your help/advice Apple people ! http://homepage.mac.com/rdsck/PhotoAlbum24.html

USB over current notice when plugging cinema display

Hello,
I have a 24-inch cinema display connected to my MacBook (aluminium, nov 2008). Both were running well until I suddenly got those warnings "USB over current notice" while working on my computer. I keep getting those warnings when I plug the USB cable of the cinema display to the MacBook. Note that I do not get those warnings when other USB devices (mouse, external HD, iPod) are connected to the Mac. I tried to reset the SMC and PRAM but not to avail. When I plug the USB cable from the cinema display to another Mac I do not get any warning. So, the cable seems OK. Any idea of what's going wrong? Tks

You've probably noticed this has been going on for years. I get it when I plug my iPhone into my Macbook.
Every update that comes gives me hope, but it hasn't been addressed yet.

Mac mini shut down with USB and USB Over Current Notice

I just spent the day dealing with my mini shutting down when I connected my iphone. If I left it connected at restart, I got the infamous USB Over Current Notice. I tried all suggestions and finally used an apple connector instead of the one I had been using. Everything OK again... Other comments? It was very time consuming and frustrating.

Do you have other devices connected to USB ports ?
Try to connect with a powerde hub in between.
and look here https://discussions.apple.com/message/7191644#7191644

USB Over Current Notice - Nothing Connected

Hey all,
so recently i hooked back up my power mac and it worked well for the first couple months.
However, today i was not so lucky. I have a 20 inch apple monitor attached, and it has 2 usb ports. Those ports are almost always plugged in, but when i try to plug them in together, now i get the message 5 times in a row: USB Over Current Notice, A USB device is currently drawing too much power. The hub to which it is attached to will be deactivated.
After playing around with it for over an hour, I've drawn a couple conclusions. If nothing is connected: it will still pop up 5 times in a row. If I have just the keyboard in (and mouse connected to keyboards USB): the message pops up, however the hub (usb on monitor) is not deactivated. If i plug in my music streamer and the keyboard: message pops up and the hub is deactivated.
Finally my troubleshooting.
Resetting the SMU: http://support.apple.com/kb/HT1436
Not sure if this is a late 2004 or late 2005 Power Mac G5, but i did it the 2004 way so far.
Resetting the PRAM: http://support.apple.com/kb/HT1379
Both have not helped the problem, if the problem still exist I will take off the aluminum cover and reset the SMU or PMU or whatever else people suggest within the next couple of days.
Currently on my laptop watching it pop up every 30 seconds between me holding return (closing the 5 windows). ugh

Yes, it's likely the Monitor hub, a common failure point, disconnect the USB to the Monitor & get an AC powered USB2 hub.

Plugging in iPhone results in USB Over Current Notice

When I plug in my iPhone I now get the following message:
USB Over Current Notice, A USB device is currently drawing too much power. The hub it is attached to will be deactivated.
I tried powering down, unplugging the power cable and removing the battery, then waiting 30 minutes and placing everything back together - still got the message.
I also reset my SMC- still got the message.

Does the iPhone connect normally to other computers/macs? Can you try another cable?

USB over current notice and other problems

I have a 17" MacBook Pro (original 2.16 Core Duo) that has a USB over current notice pop up. The pop up says that the USB hub it's attached to will be deactivated. I'm trying to troubleshoot it but can't figure out what's causing it. What exactly does this notice mean? The ports all still work. The iSight doesn't work (not even recognized in System Profiler), and I know that's on the USB bus. Could that be the problem? I noticed the pop up seemed to occur with movement. I've found that I can recreate the USB alert at any time by applying pressure to the bottom case, in the center right behind the RAM cover. This may sound strange, but while trying to figure this out, I was pressing around on the top case to the sides of the trackpad, and when doing so it made a crackling sound. It did this again when I applied pressure and the keyboard and trackpad became unresponsive. Does anyone have a clue? Thanks.

Try http://support.apple.com/kb/HT2090 to see if you can find the iSight problem.
If your iSight is still not recognized in System Profiler, you likely have hardware problems. (That hardware problem could also account for your problem "with movement" and the "crackling sound.") Contact Apple or an Apple-Authorized Service Provider for service. Tell your service provider about all your issues. My guess is that at least some are related.
If you can get your iSight working again, consider the info from these Apple technical articles:
http://support.apple.com/kb/HT1411
http://support.apple.com/kb/TA25685
http://support.apple.com/kb/HT1151
http://support.apple.com/kb/TA26511
http://support.apple.com/kb/TA25618
It seems possible to me that an unpowered (or possibly an underpowered) hub could be causing your symptoms. It also seems possible that a faulty power supply on a powered USB hub could cause bus current overload without your knowing that your hub is operating like a non-powered unit even though you have it plugged in to wall power. If you cannot check your hub's power supply, ask you Apple Technician to do it when you have your MBP checked.
EZ Jim
G5 DP 1.8GHz w/Mac OS X (10.5.6) PowerBook 1.67GHz (10.4.11) iBookSE 366MHz (10.3.9) External iSight

I keep encountering an error message about mac usb over current. What is that about?

Why is this happening? I've had this computer since 2008 and this is the first problem encountered. What is the scoop with this error message for over current in the usb?

is unpowered usb hubs are used all devices fight over the default 0.5amp current

Keep receiving "USB Over Current Notices" since updating to OSX 10.6.8. I have no devices plugged into my Imac and running everything wireless. SMB/PRAM resetting did not work. Does anyone have some advice or can help?

Keep receiving "USB Over Current Notices" since updating to OSX 10.6.8. I have no devices plugged into my Imac and running everything wireless. SMC/PRAM resetting did not work. Does anyone have some advice or can help?

Hi Melissa,
Pretty strange, but...
Safe Boot, (holding Shift key down at bootup), run Disk Utility in Applications>Utilities, then highlight your drive, click on Repair Permissions, does it happen in Safe Mode? Reboot when it completes.
(Safe boot may stay on the gray radian for a long time, let it go, it's trying to repair the Hard Drive.)

Over current status led's on AO module always on.

When we power up our FP-AO-210 module, every over current led lights, even ones on channels that are not connected. Any help.

Thanks Bill B., I have called them, and they do not seem to have any answer execpt that it is damaged. Seems odd that a brand new one gives similar results. They sudgested we replace the base. I checked the current, and it is .1 ma, well under the 1 ma max. The unit works, it is just we have to work around the errors in software. I will send one unit back for repair. Thanks.

My 15" Macbook pro gives me a "USB over current notice," NOTHING PLUGGED IN

My 15" Macbook pro always gives me a "USB over current notice" on startup and VERY frequently throughout use (I'm talking every 5 minutes) without ANYTHING plugged in. My computer is ****** up, and will often freeze without being charged, (and thats a whole other problem) but I'm almost certain the USB over current notices happened well before that. I'm 99% sure its the USB on the left side of my mac, because i'd tried connecting my Ipod to that side and got no response. Plugging it in on the right side worked fine.
I'm not turning it into the apple store, it would cost much more to fix than to buy a new one due to it being dropped one to many times, but most problems i don't mind except for this!
if there's anyway to COMPLETELY deactivate my left USB port that'd be awesome. i have absolutley no need for it since it's already obsolete.
ALL HELP IS APPRECIATED. and I'll try to be accepting if there's no real way to fix this, i understand how f'ed up it is already.
-i believe i've already reset my PRAM (or was it PMU???)
and i dont know how to reset any other fancy shmancy mac lingo and i'm not the most computer sauve person, so baby speak will totally help.

Maybe "dropped too many times" is a clue. Take it in for repair.

FOR GURUS: Over Current Notice - USB device drawing too much power

Hi,
When I plug a USB extender cable to any USB port on any Mac tested so far, I get the warning:
"USB Over Current Notice. The USB device is currently drawing too much power. The port it is attached to will be deactivated".
In fact, that freezes the Mac mouse and keyboard until the USB extender cable is unplugged, and renders the used USB port unusable until the next restart.
What is going on? Such extender cable worked fine until Virtual PC was open with Windows XP XP2 in safe mode on an iMac G5 (20-inch) with Mac OS X 10.4.3. A 1GB flash pen was inserted, and its files were seen via "My computer". Then the flash pen was taken out (without properly ejecting it via Windows) and someone inserted a 2.2 GB USB hard disk, which froze the Mac and caused the reported problem from that moment.
So it seems that the USB cable is now somehow defective, but I wonder if it could be fixed, since it does not seem to have any internal circuit but just the USB connectors and cables. So I wonder what is going on...
Thanks.

¡Hola, Gabriel!
USB Overcurrent Protection issues arise when one or more of the USB devices draw too much power or, by adding a device to a USB hub, one exceeds the current budget for the entire chain. A detailed explanation can be found in this article, where it states:"Should the cumulative current drawn by a group of downstream ports exceed a preset value, the overcurrent protector removes power from all downstream ports. Overcurrent circuits are used to protect against catastrophic device failures, software errors that lead to devices turning on when the current budget has been exceeded, and user-caused events such as the shorting out of connector pins."See also "USB: Hub Description" for important information on self-powered vs. bus-powered UBS hubs.
Your Apple Pro keyboard is a bus-powered USB hub. Some displays continaing USB ports may act as either bus-powered or self-powered hubs: one has to consult the display's documentation for details.
• If USB Overcurrent problems arise using a bus-powered, third-party USB hub, try a self-powered hub or connect the USB device directly to one of the built-in USB ports on the computer itself.
• If USB Overcurrent Protection issues arise when a device is connected directly to one of the built-in USB ports on the computer itself, then the peripheral device or its cable is either damaged or defective.
Note that you can not put two bus-powered hubs in series. In addition to the article "USB: Hub Description", see also "Apple Pro Keyboard: Devices Connected to Hub May Not Work."
Good luck!
Dr. Smoke
Author: Troubleshooting Mac® OS X

Over current

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